We had major issues using Writable Volumes lately, logintimes were up to 3min or more where as normally we see logintimes as low as 17s (see attached pic) using Windows 10 and floating pools (measured using vROPS). Of course the the logintimes we had weren't that bad when comparing to others out here, but every info that could improve this might help.
After extensive contact with VMware Support we added below registry entries and logintimes were back to normal:
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverride /t REG_DWORD /d 1 /f
reg add "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management" /v FeatureSettingsOverrideMask /t REG_DWORD /d 3 /f
Both entries have to do with Spectre patches applies to Windows 10 and in effect will disable parts of the patches: https://support.microsoft.com/en-ie/help/4072698/windows-server-guidance-to-protect-against-the-spec...
These alterations also improved speed of the desktops without Writable Volumes considerably. Going up from 2 to 3 vCPU per desktop also improved logintimes for us, you might check how this impacts your environment.
You might try this out if you can accept the possible lowered security...
If you try, please let us know the result.
